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lordfarquaadthecreator/agents-skills/mcp-bridge

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PublishedOctober 24, 2026 at 01:49 AM

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version: "1.0.1" name: mcp-bridge description: Call any MCP server binary from shell without registration. Use when an MCP is not registered but the binary is available on disk. Replaces ad-hoc JSON-RPC scripts.

MCP Bridge

Call any MCP server binary via a CLI wrapper. No registration required. No JSON-RPC knowledge required.

Prerequisites

Build the wrapper once:

bash

cd ~/agents-skills/skills/mcp-bridge/scripts/mcp-call/
go build -o mcp-call .

Binary lives at ~/agents-skills/skills/mcp-bridge/scripts/mcp-call/mcp-call.

Usage

bash

mcp-call <command...> -- <list|call|describe> [flags]

The -- separator splits the MCP server command from the wrapper subcommand.

Subcommands

Subcommand	Purpose	Example
`list`	Discover available tools	`mcp-call /path/to/binary -- list`
`call <tool>`	Call a tool with JSON args	`mcp-call /path/to/binary -- call generate_story_pdf --args '{"title":"Test"}'`
`describe <tool>`	Show tool schema + description	`mcp-call /path/to/binary -- describe generate_story_pdf`

Flags

Flag	Purpose	Default
`--args '<json>'`	JSON arguments for `call`	`{}`
`--env KEY=VAL`	Set env var on spawned process. Repeatable.	inherited from parent
`--timeout 120s`	Timeout for the operation	`120s`

Output

Text content → printed to stdout
Image content → saved to temp file, path printed to stdout
Errors → stderr, exit code 1

Known MCPs

MCP	Command	Env vars	Tools
create-story	`~/agents-skills/mcps/create-story/create-story`	none	`generate_story_pdf`
create-image	`~/agents-skills/mcps/create-image/create-image`	`COMFY_HEADLESS_URL`	`list_loras`, `list_base_models`, `generate_image`
cover-letter-writter	`~/agents-skills/mcps/cover-letter-writter/cover-letter-writter`	(check AGENTS.md)	7 tools

For Docker-based MCPs, use docker run --rm -i <image> as the command:

bash

mcp-call docker run --rm -i create-story -- list

Examples

List tools

bash

~/agents-skills/skills/mcp-bridge/scripts/mcp-call/mcp-call \
  ~/agents-skills/mcps/create-story/create-story -- list

Call a tool

bash

~/agents-skills/skills/mcp-bridge/scripts/mcp-call/mcp-call \
  ~/agents-skills/mcps/create-story/create-story -- \
  call generate_story_pdf --args '{"title":"My Story","pages":[{"image":"/path/to/img.png","text":"Once upon a time."}]}'

Call with env vars

bash

~/agents-skills/skills/mcp-bridge/scripts/mcp-call/mcp-call \
  ~/agents-skills/mcps/create-image/create-image -- \
  call list_loras \
  --env COMFYUI_API_URL=https://your-endpoint.modal.run

Describe a tool (get schema)

bash

~/agents-skills/skills/mcp-bridge/scripts/mcp-call/mcp-call \
  ~/agents-skills/mcps/create-story/create-story -- \
  describe generate_story_pdf

Workflow

Discover: list to see available tools
Inspect: describe <tool> if you need arg schema
Call: call <tool> --args '<json>' with the arguments
Parse: stdout has the result. Image paths on their own lines.

Tips

Always use list first on an unknown MCP to discover tool names
Use describe to get exact arg schema before constructing --args
For long-running tools (image generation), the default 120s timeout should suffice. Override with --timeout 300s if needed
Multiple --env flags can be passed: --env KEY1=VAL1 --env KEY2=VAL2
Args JSON must be valid JSON. Use single quotes around the whole string

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